Kumasa (くまさ さん) is a main character in the Oshi ga Budokan Ittekuretara Shinu manga by Auri Hirao, as well as the anime adaptation that will air in January of 2020. He is voiced by Tomoaki Maeno.
A man in his mid-30s who wears glasses with a fat figure.
A person who talked to Eripiyo who was watching ChamJam's outdoor live and made a story to become an idol fan. He is a top ota who has been supporting Reo since before ChamJam was formed and serves as a member of the birth festival. Formerly a company employee, but retired due to limited fan activities and is now a freelancer. Having the experience that the group to which Reo once belonged suddenly broke up, had the idea of "I don't know when it will be the last birth" and always cheered on the idols. In addition, the author tells us that in an interview he describes Kumasa as "the best good otaku that idol otaku thinks about."